This is a war game. If you don't engage in battles, you may become a target of attack by someone else. If you are not strong enough to attack or fend off other players, you can use the Protective Shield to block out other lord's attack and scouting for certain period. Protective Shield can protect the Castle and everything within the Castle. If your soldiers are on the field gathering resources, then they are exposed to attack. You can escape from enemy's attack by using the Castle Relocation. Move your Castle to somewhere far away or near your Alliance members to stay safe.